there are many reasons that make the government prohibit the circulation and use of cryptocurrency in his country, usually, the reason is that of the influence of unstable prices and because the bitcoin technology is very sophisticated that makes the government unable to commit crimes like corruption again.
you're right, but right now I feel so much good news about cryptocurrency. well, it can be said that the world has begun to accept this development. although there are still a number of reasons that have been used as a way to ban crypto, this system does not seem to stop developing.
Different rule and regulation will make to ban the cryptocurrency but governments are slowly understanding how potential the technology is going to be. Technology makes the government legalise the cryptocurrency but it is not a simple thing we have to wait for another 10 years for adoption.